Product Description
The 1141 400 4731 Control Unit is a genuine STIHL electronic ignition and control module engineered to provide precise ignition timing and dependable spark delivery for consistent chainsaw performance. This unit regulates electrical signals between the flywheel, ignition coil, and switch system—ensuring smooth starts, steady idle, and optimal engine efficiency in all conditions.

Key Features
✅ Part Number: 1141 400 4731
✅ Component Type: Ignition / Electronic Control Module
✅ Function: Controls spark timing and engine ignition sequence
✅ Material: Sealed electronic housing for vibration and moisture resistance
✅ Quality: Genuine STIHL OEM component for factory-grade reliability

Benefits
✔️ Restores Starting Performance – Provides reliable ignition even in demanding use.
✔️ Consistent Engine Operation – Delivers precise timing for smooth idle and acceleration.
✔️ Durable Electronics – Encased to resist vibration, dust, and temperature extremes.
✔️ Plug-and-Play Fit – Installs directly with factory connectors.
✔️ OEM Quality Assurance – Built to STIHL’s exact engineering standards for long service life.

Compatible With
Commonly suits STIHL MS 170, MS 171, MS 180, MS 181, and other compact chainsaws equipped with the same ignition system.
(Always confirm compatibility using your model’s serial number or OEM parts list.)

Installation Tips
1️⃣ Ensure the saw is off and the spark plug lead is disconnected.
2️⃣ Remove the top cover and air filter assembly.
3️⃣ Disconnect the old control unit’s connectors from the coil and switch wires.
4️⃣ Install the new control unit in the same mounting location.
5️⃣ Reconnect wiring, secure all clips, and reassemble covers.
6️⃣ Start the engine to verify proper ignition and smooth running.